linux-kernel - [PATCH] hpfs: Annotate struct hpfs_dirent with __counted

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Date: Mon, 13 May 2024 16:45:54 -0700
From: Bill Wendling <morbo@...gle.com>
To: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>, Kees Cook <keescook@...omium.org>, 
	"Gustavo A . R . Silva" <gustavoars@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	LKML <linux-kernel@...r.kernel.org>, linux-hardening@...r.kernel.org, 
	clang-built-linux <llvm@...ts.linux.dev>
Subject: [PATCH] hpfs: Annotate struct hpfs_dirent with __counted_by

Prepare for the coming implementation by GCC and Clang of the
__counted_by attribute. Flexible array members annotated with
__counted_by can have their accesses bounds-checked at run-time checking
via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE
(for strcpy/memcpy-family functions).

Cc: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc: Kees Cook <keescook@...omium.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Justin Stitt <justinstitt@...gle.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
Cc: llvm@...ts.linux.dev
Signed-off-by: Bill Wendling <morbo@...gle.com>
---
 fs/hpfs/hpfs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h
index 281dec8f636b..ac137787f1f9 100644
--- a/fs/hpfs/hpfs.h
+++ b/fs/hpfs/hpfs.h
@@ -357,7 +357,7 @@ struct hpfs_dirent {
   u8 ix; /* code page index (of filename), see
     struct code_page_data */
   u8 namelen; /* file name length */
-  u8 name[]; /* file name */
+  u8 name[] __counted_by(namelen); /* file name */
   /* dnode_secno down;   btree down pointer, if present,
        follows name on next word boundary, or maybe it
    precedes next dirent, which is on a word boundary. */
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog